Observation of the Narrow State X(3872)J/ψπ+π in p¯p Collisions at s=1.96TeV

D. Acosta et al. (CDF II Collaboration)
Phys. Rev. Lett. 93, 072001 – Published 9 August 2004

Abstract

We report the observation of a narrow state decaying into J/ψπ+π and produced in 220   pb1 of p̄p collisions at s=1.96   TeV in the CDF II experiment. We observe 730±90 decays. The mass is measured to be 3871.3±0.7(stat)±0.4(syst)   MeV/c2, with an observed width consistent with the detector resolution. This is in agreement with the recent observation by the Belle Collaboration of the X(3872) meson.

  • Figure
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  • Received 4 December 2003

DOI:https://doi.org/10.1103/PhysRevLett.93.072001

©2004 American Physical Society

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Vol. 93, Iss. 7 — 13 August 2004

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